django filter 找不到合适的解决方案

Question

我的模特：

class Order(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="order_user")
    first_name = models.CharField(_('first name'), max_length=50)
    last_name = models.CharField(_('last name'), max_length=50)
    email = models.EmailField(_('e-mail'))
    address = models.CharField(_('address'), max_length=250)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

class OrderItem(models.Model):
   id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
   order = models.ForeignKey(Order, related_name='items', on_delete=models.CASCADE)
   product = models.ForeignKey(Product, related_name='order_items', on_delete=models.CASCADE)
   shop = models.ForeignKey(MyShop, related_name='shop_order', on_delete=models.CASCADE)
   price = models.DecimalField(max_digits=10, decimal_places=2)
   quantity = models.PositiveIntegerField(default=1)

我的观点：

def shop_orders(request):
    order = Order.objects.filter(items__shop=request.user.user_profile_shop)
    return render(request, 'account/paneli/shop/orders/shop_orders.html', {'order': order,})

在模板中，它显示了商店的订单，但它显示了所有商店的 OrderItem

{% for order in order  %}
    order.id #it ok  
    {% for item in order.items.all %}
      
        {{ item.product }}# wrong shows the OrderItem of all the shops
       
    {% endfor %}
{% endfor %}

你能帮我找个我做错的地方吗

订单中有很多店铺的商品，我想过滤订单只有当前店铺的商品

Answer 1

您可以使用 prefetch_related with Prefetch() objects 来筛选相关对象（此外，这可以通过解决 N + 1 问题提高效率）：

from django.db.models import Prefetch


def shop_orders(request):
    orders = Order.objects.prefetch_related(
        Prefetch(
            'items',
            queryset=OrderItem.objects.filter(shop=request.user.user_profile_shop).select_related('shop'),
            to_attr='items_from_specific_shop'
        )
    )
    return render(request, 'account/paneli/shop/orders/shop_orders.html', {'orders': orders,})

然后在模板中可以这样写：

{% for order in orders %}
    order.id
    {% for item in order.items_from_specific_shop %}      
        {{ item.product }}
    {% endfor %}
{% endfor %}

Answer 2

用户在 order_item

的商店字段中使用相关名称进行反向查询

def shop_orders(request):
    order = Order.objects.filter(items__shop=request.user.user_profile_shop)
    shop = current_shop#get a shop whose items you need
    
    order_for_shop = shop.shop_order.all()
    return render(request, 'account/paneli/shop/orders/shop_orders.html', {'order': order_for_shop,})

django filter 找不到合适的解决方案

django filter can't find a right solution

django

django-templates

django-models

django-forms

django-views